I have the wide wheel spacing on our 2014 Heartland Wilderness TT. I don't notice any better tracking with the wide stance or problems turning over our old trailers. I would not pass on a TT just because it has wide wheel spacing but would far prefer standard wheel spacing.
Reason being if one tire looses air the good tire will hold it up off the ground or at least the rim off the ground. With wide spacing wheels one tire goes flat it will go all the way to the ground and do bad things to both the road and the rim. Forget about the tire it long gone. Oh a new 14" aluminum rim from Heartland is $198.50 shipped, plus the $100.00 for the new tire.